The SORCE Total Irradiance Monitor (TIM) measures the total solar irradiance (TSI), the spatially and spectrally integrated absolute intensity of solar radiation, at the top of the Earth's atmosphere. The SORCE TSI data are produced both as daily and 6-hourly mean irradiances reported at a solar distance of 1 astronomical unit (AU) and zero relative line-of-sight velocity with respect to the Sun, as well as the Earth's center. Each TSI product contains science results for the entire SORCE mission (beginning February 25, 2003) and is updated daily to include new measurements. Learn more about SORCE TSI data products.
|Temporal Cadence||Daily and 6-Hourly|
|Detector||Active Cavity Radiometer (ambient temperature)|
|Accuracy||350 ppm (1 σ)|
|Long-Term Repeatability||10 ppm per year (1 σ)|